| 1 | /* $Id: filesystem.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT Filesystem API (Filesystem) - generic code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012-2016 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP LOG_GROUP_DEFAULT
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| 32 | #include <iprt/types.h>
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| 33 | #include <iprt/assert.h>
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| 34 | #include <iprt/mem.h>
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| 35 | #include <iprt/filesystem.h>
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| 36 | #include <iprt/err.h>
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| 37 | #include <iprt/asm.h>
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| 38 | #include <iprt/string.h>
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| 39 | #include <iprt/list.h>
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| 40 | #include "internal/filesystem.h"
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| 41 |
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| 42 |
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| 43 | /*********************************************************************************************************************************
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| 44 | * Global variables *
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| 45 | *********************************************************************************************************************************/
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| 46 |
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| 47 | /**
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| 48 | * Supported volume formats.
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| 49 | */
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| 50 | static PCRTFILESYSTEMDESC g_aFsFmts[] =
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| 51 | {
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| 52 | &g_rtFsExt
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| 53 | };
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| 54 |
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| 55 | static int rtFsGetFormat(RTVFSFILE hVfsFile, PCRTFILESYSTEMDESC *ppFsDesc)
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| 56 | {
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| 57 | int rc = VINF_SUCCESS;
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| 58 | uint32_t uScoreMax = RTFILESYSTEM_MATCH_SCORE_UNSUPPORTED;
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| 59 | PCRTFILESYSTEMDESC pFsFmtMatch = NULL;
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| 60 |
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| 61 | for (unsigned i = 0; i < RT_ELEMENTS(g_aFsFmts); i++)
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| 62 | {
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| 63 | uint32_t uScore;
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| 64 | PCRTFILESYSTEMDESC pFsFmt = g_aFsFmts[i];
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| 65 |
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| 66 | rc = pFsFmt->pfnProbe(hVfsFile, &uScore);
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| 67 | if ( RT_SUCCESS(rc)
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| 68 | && uScore > uScoreMax)
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| 69 | {
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| 70 | pFsFmtMatch = pFsFmt;
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| 71 | uScoreMax = uScore;
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| 72 | }
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| 73 | else if (RT_FAILURE(rc))
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| 74 | break;
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| 75 | }
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| 76 |
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| 77 | if (RT_SUCCESS(rc))
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| 78 | {
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| 79 | if (uScoreMax > RTFILESYSTEM_MATCH_SCORE_UNSUPPORTED)
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| 80 | {
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| 81 | AssertPtr(pFsFmtMatch);
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| 82 | *ppFsDesc = pFsFmtMatch;
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| 83 | }
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| 84 | else
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| 85 | rc = VERR_NOT_SUPPORTED;
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| 86 | }
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| 87 |
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| 88 | return rc;
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| 89 | }
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| 90 |
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| 91 | RTDECL(int) RTFilesystemVfsFromFile(RTVFSFILE hVfsFile, PRTVFS phVfs)
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| 92 | {
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| 93 | int rc = VINF_SUCCESS;
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| 94 | PCRTFILESYSTEMDESC pFsDesc = NULL;
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| 95 | RTVFS hVfs = NIL_RTVFS;
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| 96 | void *pvThis = NULL;
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| 97 |
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| 98 | AssertPtrReturn(hVfsFile, VERR_INVALID_HANDLE);
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| 99 | AssertPtrReturn(phVfs, VERR_INVALID_POINTER);
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| 100 |
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| 101 | rc = rtFsGetFormat(hVfsFile, &pFsDesc);
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| 102 | if (RT_SUCCESS(rc))
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| 103 | {
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| 104 | rc = RTVfsNew(&pFsDesc->VfsOps, pFsDesc->cbFs, NIL_RTVFS, NIL_RTVFSLOCK,
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| 105 | &hVfs, &pvThis);
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| 106 | if (RT_SUCCESS(rc))
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| 107 | {
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| 108 | rc = pFsDesc->pfnInit(pvThis, hVfsFile);
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| 109 | if (RT_SUCCESS(rc))
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| 110 | *phVfs = hVfs;
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| 111 | else
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| 112 | RTVfsRelease(hVfs);
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| 113 | }
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| 114 | }
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| 115 |
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| 116 | return rc;
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| 117 | }
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| 118 |
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